Bush SRP41 sensor missing and sonotone wiring advice - UK Vintage Radio Repair and Restoration Discussion Forum

K.C.pye1958 · 21st Nov 2019, 12:40 am

Hello.

I bought an SRP41 and when I examined it I noticed it was missing the sensor, I opened up the cap to look inside thinking it was stuck but can't seem to see it. Therefore is there a way to fix this or will I need to put in a new sensor from a spare BSR and if so is it tricky?

Then I played a record and there seemed a buzzing sound coming through from time to time and I looked at the cartridge and one wire was not connected out of the four so I unscrewed it to have a closer look and low and behold didn't all the wires slip out.

Now I don't know how to reattach the right wires to the terminals, also I can't seem to attach them either properly, ( I don't have reading glasses, perhaps i should see an optician?) as they seem very hard to clip on. I know, should've gone to Specsavers!!

All advice and consolations are welcome.

ben · 21st Nov 2019, 12:50 am

First off: what do you mean by 'sensor'? Do you mean the Magidisk feeler arm that detects the record size? see here

K.C.pye1958 · 21st Nov 2019, 1:16 am

Yes Ben,
and the good news is i found it was stuck so far in that i had to use a knife to prize it out, now the problem seems that it doesn't spring back up automatically when used eg. a 33 rpm record and wondering is it in need of wd40 or is it out of the cogs so to speak i have watched it as i use the rej mode and all parts inside seem to be working right but it doesn't spring back up, ( i really am incompetent when it comes to these things and don't want to make a bad matter worse in this case so if it is out of sync i would need a diagram or clear instructions how to fix it)
kenneth

ben · 21st Nov 2019, 10:19 am

Good news that it isn't missing!
Basically a common problem on these is hardened grease causing what you describe. They're a b****er to get to, unfortunately. Perhaps a bit of oil on the end of a screwdriver applied to the joints as you move it up and down might help but the real cure is a strip down.

Edward Huggins · 21st Nov 2019, 10:52 am

Can you confirm your cartridge is a Sonotone 8TA with 4 parallel connectors coming from the rear?

K.C.pye1958 · 21st Nov 2019, 5:40 pm

Hi Edward,
yes it is the red and gold cartridge, i think it's the original cartridge

K.C.pye1958 · 21st Nov 2019, 5:43 pm

Thanks Ben,
in this case there is a cap over the mechanism that i removed so i'll try what you advised and see (Fingers Crossed)

21st Nov 2019, 12:40 am	#1
K.C.pye1958 Pentode Join Date: May 2015 Location: Cork, Munster, Ireland Posts: 114	Bush SRP41 sensor missing and sonotone wiring advice Hello. I bought an SRP41 and when I examined it I noticed it was missing the sensor, I opened up the cap to look inside thinking it was stuck but can't seem to see it. Therefore is there a way to fix this or will I need to put in a new sensor from a spare BSR and if so is it tricky? Then I played a record and there seemed a buzzing sound coming through from time to time and I looked at the cartridge and one wire was not connected out of the four so I unscrewed it to have a closer look and low and behold didn't all the wires slip out. Now I don't know how to reattach the right wires to the terminals, also I can't seem to attach them either properly, ( I don't have reading glasses, perhaps i should see an optician?) as they seem very hard to clip on. I know, should've gone to Specsavers!! All advice and consolations are welcome.

21st Nov 2019, 12:50 am	#2
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Srp 41 sensor missing and sonotone wiring advice First off: what do you mean by 'sensor'? Do you mean the Magidisk feeler arm that detects the record size? see here __________________ Regards, Ben.

21st Nov 2019, 1:16 am	#3
K.C.pye1958 Pentode Join Date: May 2015 Location: Cork, Munster, Ireland Posts: 114	Re: Srp 41 sensor missing and sonotone wiring advice Yes Ben, and the good news is i found it was stuck so far in that i had to use a knife to prize it out, now the problem seems that it doesn't spring back up automatically when used eg. a 33 rpm record and wondering is it in need of wd40 or is it out of the cogs so to speak i have watched it as i use the rej mode and all parts inside seem to be working right but it doesn't spring back up, ( i really am incompetent when it comes to these things and don't want to make a bad matter worse in this case so if it is out of sync i would need a diagram or clear instructions how to fix it) kenneth

21st Nov 2019, 10:19 am	#4
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Srp 41 sensor missing and sonotone wiring advice Good news that it isn't missing! Basically a common problem on these is hardened grease causing what you describe. They're a b****er to get to, unfortunately. Perhaps a bit of oil on the end of a screwdriver applied to the joints as you move it up and down might help but the real cure is a strip down. __________________ Regards, Ben.

21st Nov 2019, 10:52 am	#5
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,340	Re: Srp 41 sensor missing and sonotone wiring advice Can you confirm your cartridge is a Sonotone 8TA with 4 parallel connectors coming from the rear? __________________ Edward.

21st Nov 2019, 5:40 pm	#6
K.C.pye1958 Pentode Join Date: May 2015 Location: Cork, Munster, Ireland Posts: 114	Re: Bush SRP41 sensor missing and sonotone wiring advice Hi Edward, yes it is the red and gold cartridge, i think it's the original cartridge

21st Nov 2019, 5:43 pm	#7
K.C.pye1958 Pentode Join Date: May 2015 Location: Cork, Munster, Ireland Posts: 114	Re: Bush SRP41 sensor missing and sonotone wiring advice Thanks Ben, in this case there is a cap over the mechanism that i removed so i'll try what you advised and see (Fingers Crossed)